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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800c7eb83b3e412b8432bf5490c29042d0c5203b1492b9e8e297def3bb0e0b81' 
  AND token = 'igjM0w8n/5p/3rXgRN8vohcHZV8N7vu/G/raP03FrIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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