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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a945b89a9d49cd377ddca48ff5b776594baf49a14a6351835bef0d8783b938' 
  AND token = 'g2NaC3IO599tmPzhQWyMRl38p4Sph51eaFV6p3RLe1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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