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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142dd417d4f70fb8ec38e73389a935bfb0d7e70fa06e05017d63109bcaadfc36' 
  AND token = 'kkgrQS5/q5QesoC6/lDG099YvURSxKn3DYBTOBOoP/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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