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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8781ba2a97679516cfc2a9a2d129f3d03b9b6bdb6289f5907c4fe49450f15e' 
  AND token = '58ap7fSMLVmVrFgUuw7iWja7MxGAoIu7tQlPMBh4JkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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