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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9556e5ab55b4e5ab4b7d42c62b4a5d320824447674bd5881fd4216f1cbef3e8e' 
  AND token = 'czFLrUZ2HcUskiU5CV/GlBk5+H6XyAVw+T1swi0Vg6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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