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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c113802d86fef4c6d7f7e9f5e77100e33b7b461733f42220c17c14b1a2e236a5' 
  AND token = 'aQc2PB9UhCA5jZf+Ow7Ak599U23hrqGyXTzhRyxhSMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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