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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19354bcd432c393b7efa89eb73e6cf2d039ae7f4a17333385f84d3fa5301fff' 
  AND token = '3jpQlUAtFbZxO4oU3VI1PmWHTHPioqCKpyE4KZyedeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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