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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbe81cf5d17191dd33864d753bcbcf40436697521e9ac99d51f5cdbf2266cd9' 
  AND token = '/5I7MO87tGAKmn2KA8jiRc4M6/f0m+G4kN72KJMIEFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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