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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c67f8756f30dbb1669fe688d781d88c58fa1f4d0d9c934efd4c2030a08acb3' 
  AND token = 'B77OsP0xkbQ5DYTNMzhD6qI1Vs84wC6mLN2u5fcqTgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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