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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55871f4763fd02f65b28b41d3ea80428f3e3af04ca3b4b30ce1ddd3e95e8c5e0' 
  AND token = 'vQ2Rmty5Q2MEybgDq4XzOx7uX/2Qu8un5PEs5vItyUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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