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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5515f56d9522a3b592a2cf10ee539276fa5ce7e946c5f29781d905db478789' 
  AND token = 'c2y+oBgGHNnHpp8csACFN0MbD7MicLfyKz/QqY+x2a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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