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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5acb1af3e557212df9eb66cc11c8f4e3125cc4a4d49a2de49e3f6100d631ae0' 
  AND token = '+EEWJEiPTkDpLLbDltNzyIvjNHN7970HW02V2ixK8ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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