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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c7284a978d3dde185d87755011fd2d38a713808a69ea77fa19f56caa074570' 
  AND token = 'gtsDeeVExt7u8FjrMH1yIXEuJYAA4XKvim8K757eZg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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