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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090060fb8c1a8251583f7992d6a7a0475c639d0217628df517e4ef4713ca2175' 
  AND token = 'HXOB3p2hgXCMJodPN2Lej6fAVtLo8d6HNnUjy55hoqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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