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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400b6cebcf8e18e761474c2ba484f18a1f101ba80aa760545e3fcfffa1dc8a15' 
  AND token = '2jpC87ekKQGALEGTtQ1LRVV+BXobUxKx3j9K9Q3NLC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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