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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6edf154e82ce1e6c062e1902aaecb7fc8b14687003ef9154542b985210e6886' 
  AND token = 'G03Vb7Q/lhAQQ3WSOGvDjHUKFhaQwUX3ElsfcDsTpLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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