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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f4316569e053e2084d341a2d8a06d335c606eb2148173119f294b190420427' 
  AND token = 'xkwlcjpKWdMAhLXFTpyNu6EHX5u+jKW+MNPzuimkamU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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