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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f169878186715b517a67719fab70ecc8853843a3a257f24ad7ba4070efb8eaa1' 
  AND token = '/+dZ11fpwujXXAC0svPSFySj1VU4nn/oNKubOq9+TJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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