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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaefb5e3927812758041ddcd6b3073bad0aa39a88d24005a6b6bcff5ae8b37f' 
  AND token = 'gccuYm6qgtBoS+ztG+PkSij4YEl9YqNpINsYlQxav8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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