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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fd48be2a85200ac1f67ad8eb0d5e98e92997c6f0c5c03017e945426c0b33e9' 
  AND token = 'TTtJcL0zBFmz6NmHWA78huxJAss7GCqWorQfyJtESEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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