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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab0b082a03587b4e4352f41951d2e42665b4bbae3ecd5755131f95f2317a687' 
  AND token = 'f5lNxTnR6pzIJ7srxxuSfUfA1t9pTllx3P7TqSQxoSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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