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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187627a3d3ae7c342da3909123427a76654067224c47d0b553517763ec8041b7' 
  AND token = 'u2arvXUqhpQ++zHyGEGhsB1+lkNm5SOB9jo49ILl0Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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