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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a77943a7c8c3f4c1e5bd93d84916a1b2f64dad4ac7a27b102164da740084c0' 
  AND token = 'bd3q3Y7tlxOLUnMLeCI38zXIJrErW/xB/KpHeR0McdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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