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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff5b5bf32bec42fcbfa474871c90b4d4054113d5ac25fb0f6d3a9266ba9d1e3' 
  AND token = '62mHwZ09LD0SVtc63R6FHIpmqH3zqYBQnDILjhHA8tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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