SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf39e431f931b53c2e0b40b58a933e62e27f758a96dffae287f115369c04aed' 
  AND token = 'HvGrCmauQO8GJ7gtjt6pnhhYdgs0ix2K7oKpn4wLEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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