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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90eb2c19f8bf25107f8c8b930eee8eb728641e5631b4994ba4147971612c1c5' 
  AND token = 'DX4LDC2jn1JrkoU9tWGoQKxfL33OqnAPLjaW7l3BYlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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