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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264d0b8383d6a633c3b4857607bd53081cc4d78ce3450fc75783b7c7a3410c7d' 
  AND token = 'MZDZ3lAkSmsjN8mOpqdoq6v1a336MhpNnOpX6cbUmIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}