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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8756f825ef5f8b7aed5230a686b9e1123d46d99e1ff03e803027d283a3ff448d' 
  AND token = 'wFQeU/Ep1S1ytQlA4jPBM55Frdq1BBAsNrzv52KjQak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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