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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54d94a7b50e4b8f19893f04426408b7940a0c2a4e06f435f35df9244c8a8b00' 
  AND token = 'WqGoyvIdLpbJ30tRro9Jtzom4OUYKRXzvowTY4in0AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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