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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0c98c62378d6d0a168a1a41eec49a63e4cf6b1520f5d0ec0c04046aae17316' 
  AND token = 'v9aT9/lFsSwzroXVDawXJIkpWGPpftPX7FFLiDm5KHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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