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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6715f6312ce18011fe0829499fa4a521692949ef79afaaec677f0e1b730b3820' 
  AND token = '7Ar1P0AGecu+yCNI1AJy0kTGwIjUeQ/DPGLs8hK+OSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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