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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9d2e7d3a345acba7e079201867097e7365cf23da8ceae21cfeff589eb2b995' 
  AND token = 'mcv0NhOJQPz+VjHQxk6M0m/JOKIREdrgkjec1Y0GOCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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