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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b393d2f90d898e6af05a9e4aed10bcfd9d264df224399594acd434257cf34c41' 
  AND token = '57HjOOQqQlyUxrAOpBizy7X76zoVnmvyQen9YJJt03U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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