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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55da2f7b380c46e006a2c1e170460fe2116ca3474f9802cd7bbcf50ed985734a' 
  AND token = 'Cz/3Oaa6n5AoUGYQG23ID9/9RwEPw/r3MGnbODhsUTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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