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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdee97fa592c02fecc40dc2e527ee1d3d2529ae6071f8133adf1503bea844c01' 
  AND token = 'fN47I/7ds+Lv94Lvlsih79ztAM6Ccgf87RbwxBKSDtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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