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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dc3ec5b2aff50f16d2e597da5f56b70783993b4e3a90df7fabcd02fe656525' 
  AND token = 'oa6y8OuJ9rr1CloHVMJYcGthNKMWFLgPQbAqlVIu+5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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