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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f6436601c402d65f2e71eb76b83ec9ddc15aab43cc0489e3414ef55b19f767' 
  AND token = '58gnG3E2cIPG9ZvH052YL12o77PvVwd8eF2wkOPyz1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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