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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046210a74682670a4f01a4b08ec90569fe192ec34e7553c4aaeee21b9b32882d' 
  AND token = '/GVDrkR/o/4mmqzN8mmbZSEch/3YJugl2fC2ao2HGF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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