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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eecb007fee19d15f70573976611934f0f0acda78baf3931824c9814ad8eba6' 
  AND token = 'j7AV6EgNOYkKm98DP0aE2Es3PGv0+rzNjBD1uSYnWDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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