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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d42684095c07367bec45c8baade973ff7baa5c40bd3bbe3e91be832ed43a02' 
  AND token = 'NQIBkC7bY+54itRhWMiUbchlVu1hUWLNAmV/BdCjBWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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