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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261431b76a22751a1eef9486ddad13abcc0928a5878c366ae98ef9ac98760113' 
  AND token = 'W1ZGgxrk68O3u/P6j2GeS6oJo7ZuolFaCNuJsexaKek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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