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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5045bbb73c4397e0de71686d92b5922a33cf2680ed8fee2afa13ad1f396d39d9' 
  AND token = 'vkyF3DgNLVyZaighL4ON7EYiyqOpibEcfkT28qJ/+tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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