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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fa6b998f8cc2cdfd263a300ce4ce938bad42860c11630d3ee92bb1d919a467' 
  AND token = 'YMrpFENnZjRGcyu1UdVC3Lsd4mCIkHXB6mqYA09VL0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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