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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1af59cfefa93a5a8c9e4601a73ade66cd6b07bd35fd3e93968029baf2aef8a' 
  AND token = '/BOixKjG1BocbU7xkwZny58z4xSWk64xY4XvKy+U1vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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