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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc624f6995655a42900de9a987e49cda345250c30c3ba6a669d61f898a0e517' 
  AND token = 'pNGmGrgAHe/MrAjiopZz6Nw3/bmxTp+wkF3Wc1LZaQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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