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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fa35deed5182e07c8e41aa2a1626850a3a5e79f8367b8b5bd3914b32350c9b' 
  AND token = '7prIxq6HSVdsnOT/IA2DnJVHwifU7NATC8WE0gPohaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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