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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894e081bc07f8af1cbdad6d43574320dc46a6e44614a132d964f3f9ba93ce138' 
  AND token = 'sD30OH8PNWLUJ6NS8jocd3WTwvvqEzcG/F0EQfWlPfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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