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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5f889e91fd8561c37fad7c97118b569679aff4bf2524286017296c2c4b0ff0' 
  AND token = 'ErsRYqoDZgdQ1pwTAeDvuThcpxbaRaCcEiK4Fq/fLJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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