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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e324bef4734c692d89050d6b4513a01f19bd76195e5ffc10dd13781e91783b' 
  AND token = 'ubBtEn1NbNR5iFnPgjaFzu3He4/g12gKXSqPABrPN2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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