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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd512cb36cc9e31ce139deff8edd834a2e1b2d91a31400340a867d087bdd8d14a' 
  AND token = 'BcUrvWRiRDGC8FeVMlctzJn4jNZvDkZP3kKN6+UkfeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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