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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98df398c99f3a82a0b42b9f46b12dfc14ff81f7756cf1ae9489f1616a0e5f39' 
  AND token = 'BhEa9WmoOoTvq8ZPTNhOF4HNLL5bR1V3OHOEz3DEr+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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